Meet b from breathe with b: a smart, pocket-sized mindfulness device that improves your focus and lowers stress by teaching you how to breathe properly. It comes with Bluetooth, a pressure sensor, and LED lights to measure and visualize your breathing. Its software provides you with routines to improve your breathing habits.
The companion app lets you track your progress on your smartphone. The device has a flexible mouthpiece and uses vibration cues and calming sounds to guide you. More info is available here.